Locomotive boiler



NOV. 14, 1933. C, Q HAWLEY i 1,934,800

LOCOMOT IVE BOILER Filed Nov. 5. 1931 3 Sheets-Sheet 1 @006Go QQQOOOOO@GOGO OOOO man@ am@ Nov. 14, 1933. c. G. HAwLEY LOCOMOTIVE BOILER FiledNov. 5, 1931 5 Sheets-Sheet 2 lill 3 32 22 23 22 vieil/es GM NOV. 14, C.G. HAWLEY LOCOMOTIVE BOILER Filed Nov. 5, 1931 3 Sheets-Sheet 3 motiveboilers and it consists ofvthematters here-Y and flash walls areeasilyobtainable; Y 1

inafterdescrbed and 'moreparti'c'ularly pointedA Still'anotherfobject'ofthe-inventionistofprooutin'the-appended elaims. videafconstr-uctionof-.tliskind wherein the parts V5 The invention is particularlyconcerned vwith-fare sordisposedas'to present suicient'area ofthe 60boilersof the kind `embodying gratelessfireboxes inside throat sheet 'ofthe firebox permittingthe vin which fuel ysuehas oil or powdered coal iseasyattachmentof the neckof-a thermic Siphon" burned! in suspensiontherein, the rebox being should itbe desired ito install suchja`siphonin` substantiallywholly bottomed by inwardly and g the liirebox.f

" downwardly eXtending--atwater steaming land The abovementioned objectsrofv the invention', 65

circulating elements. A aswell as othersytogether With-the many advanv.The' primaryobject o 'fithe -inventionris to pro-- *tages `thereof,willmore fully appear,` as I'proceed vide an improved arrangement of `theparts 'more with'mylspecificationl 'Y orless.associatedWith saidWatersteaming and -`In thedrawings:--` f circulatingelements-wherein'there is no direct" :@Eig.' V1 isa-longitudinalverticalsectionalview:2

and contacting engagement between the ends of through thevreboxaend of alocomotiveboiler I said elements andfthe'refract'ory materialformvembodying'myinvention. a f ing the-burner and ash walls-of `thelireboxV vFig. 2Y isa. transverse vertical vsectional -view' wherebypassageways are provided Yfor theair through the same'fas-taken'on theline 2-21of Y necessaryto support combustion andwhichairfis; Fig.1Y-lookingt0wa`11d thebuinerwall end o 'f the 75 vide more yeicientcombustionv 'y' "Figl S'S'another transversevvertical sectional 'Anotherobject ofV the invention-iste provide v-iewt1ir011gh*he bottom'iear'endpart of the 1' an improvedarrangement for the inner ancl '?a"' lj a`lBbOXS Vtakllfonthe'lne' 3-3' 0f Fig. lflOOkk cent, though spaced bottommargins ofy 'saidieieb ing towardthe'flash wall end of the rebox. 8'0;Y,

ments-, wherein` air is better distributed-forcom- Fig. iS Ya' detailfragmentary VGWTD OO- bustion purposeswithout -a localization ol.rsuchtemplari, `on an enlarged scale, ofl the fronti air at any one pointin itsventrance 'mtohe ref y er1-d Axoffthe Water steamingandzirculatihe Yele-jY Y ments'and associated parts.`

Vbo'X inthe 'space betWeen-said elements.l

f- A-'futhe object of thefinvention"isy to so v:'F155isatdetailverticalYsectionalvievvthrough 85 v I range the parts of theWaterstea'ming and'circu-a lialSShOWIl il Fig. 413S`-7ake-0nthe lille 55. lating elements ywithrespectto theburnerwall QfFg-g4 I gf andbottmclosur 4pam for the rebox'thaf auf LFig.- 6 is` a detailtransve'r's`e -vertical' sectional chambers are provided between saidelement'sandv` VeWSmarjtOFg. Y3 illustratiig. amodifled form`xpanwherein the'secondaryai-r neoessaryftojsupiv Oflwater ys'tmali'lfgand CGUMH elemen- -90 port combustion 'is preheated'by'gaid elements,Fig 7 is adetail transverse vertical sectional before itis admitted -tothe reboxproper for" ViW-''Silllalf'tb Fg- 2LaI1d .ShOWS- a'furthermod-icombustion purposes. Y f fied Vf ormiof Water steamingand'ci'reulating ele; Anotherobjectof theinvention is to soairage ment'7:1 Q f' .t 4o vthe elements in the nrebox'that mud chambers* lFig.8--is aidiagrammaticfhorizontal; plan Sec-95j of greater capacity areprovided at the rear endsA v 'OllalVeW"througlgthe lebOX T011 al'reduced ofthe side water legs, out of the Zone of -influence SCl'Stk'rl @n'he I IIQaf- 0f Fig. Tand illus-i ofthe high temperature lin the'reb'ox so thati trates flmrepartulaiflyfthe Shapey 0f the ail insteadof hardeningandthus adhering totheas'solet Slot betweehfflsaid Water-St'eaming and @ir Y fishing; Still another object of the invention istofso wFig; y9 -iS"aview similar t0 Fig. 8`Whe1einthe` dispose theelements in said rebox thatthey' air` inlet slot between said elementsconverges will have-an 'inclinationwgiving a natural-'flow offrom 'therear endtowardtherfront end ofthe` Ciatesheet it'r'emainssoft'anislushyforleagvy culatingelem'entwhen arranged in the manner 160 rear endof said element.' Eig.y l0l is a View similar to Fig-.18 whereinlthe`Stilla further object of the invention yis to proairinletslotbetween'saidelement converges from' vide means carried by the fends'ofsaid elements] the yfront endh toward the rearv end of thefirebox.'whiehare adjustable whereby thef lesi'reddimen`A` In general,myinventioncentemplates the pro- 5 "sions lof the ai'inlet crevicesorslotsbetween the`vr visionof `-a `pairoflat',l 'hollow Water steamingll-Ovand circulating elementsthat extend downwardly and forwardly from theinner rear sheet of the firebox toward the front thereof, f as well asdownwardly and inwardly from each side sheet with which it communicates.Said elements terminate in a substantially close spaced relation toprovide a central'longitudinal air inlet slot between the inner sides ofsaid elements along thel median plane of the irebox. The'front and rear`ends of the reboxare closed by a burner wall anda ash wall respectively,each spaced from the associated Vends of said element thereby leavingtransversely extending front and lrearend air inlet slots; .v j YBetween Vsaid burner and fia'sh walls, below said elements and extendingfrom one side of the iirebox to the other, is a bottom pan or closure,

which coacts with said wall to provide an air preheating chamber beneathsaid Velements and.

with which the slots above mentioned communicate; Secondary air isadmitted into this chamber through suitable door controlled openingsinVtheburner wall and` after being heated therein by contactV with `thebottom walls ofv said elements, passes lthrough said slots intothe'reboxto support combustionA therein and as theseslots are disposed atv theends and along thevmedian` line of the firebox, a better distribution ofair for such combustion purposes is afforded. The4 elements carry attheir'.` ends adjustable plates whereby the width of said end slotsmaybe care-.

fully determined, thls providing-that Aamount of Y air yieldingl thehighest efciency in combustion.

By inclining-the elements in. themanner above mentioned, Va greaterportion of theinside throat sheet, above the burner lwall isexposed forthe attachment of the neck of an associated siphon or siphons.Furthermore such an inclination leaves larger anddeeper mud chambers at.the rear ends of theside water legs-wherein the 'mud remains'l soft andmay be .easiiyflushedout and aga-insuch inclination provides ameren-natural water that circulation is.thereby.increased.

Referring now in detail fto that embodiment the invention illustrated inthe accompanying drawingsand especially, to Figs, 1, 2, .3v and 4thereof-# 1 indicates thebarreL of the boiler in `the rear endvof vwhichis-.provided they usualfireboxV 2. Saidirebox is constituted by thefront or flue sheet', rear sheet aside-sheets 5-15 and crown sheet 6 andthebottom portion of the iiue sheet'is formed to provide the insidethroatsheet The ,wrapper togetherpwith the `firebox sheets described,provide ltheseveral water legs of the boiler, that is, the side waterlegs 12, the front leg or throat 13 and the-back legA lit all bottomedk"by a'mud ring 15.- The firebox sheets arejoined to the wrapper bymeans of the usual staybo'lts,A and the rear sheettand-the` backY plateV11 are' formed to provideva door opening v16` whichis normally closed.v A

The iirebox structure abovegdescribed maybe f takenas typical ofstandard practice and includes all essential parts except Vthe gratewhich, ofr

course, when fuel is burned in suspensioni's, omitted and the openbottom of the rebox isv closed aswill later appear; Y f r In the openbottom ofthe lrebox is located a pair of fiat hollow Waterstearning andcirculating elements orwails 174-17 respectively,- each of which isconnected .along one sideto ,an associ-r ated side sheet 5 and extendsdownwardly and f forwardly at an inclination considerably greater thanthat of those parts of the mud ring 15 clos- -ing the bottom of the sideWater legs 12. Said elements also extend downwardly and inwardly fromtheir associated side sheets. Each element issubstantially andconveniently rectangular in plan Yand is longer -than'it iswide and isopen at one .side and is` closed at its other Yside as well as at'itsends.l VEach element comprises, in this instance, relatively straight,hat, top and bottom staybolted walls 18 and 19 respectively and frontand rear end walls 20-21 and that side of said element opposite its openside is closed by a rounded wall 22. The rounded walls 22 of bothelements are quite closely spaced to provide a longitudinally extendingair inlet slot 23 in the median plane of the iirebox. The open side of4each element is defined by flanges 17a which are rbutt YweldedV as at17h in suitable openings prothe firebox isone of such walls that formstheV front or burner wall 24 and associated with the rearendof saidelements and also'extending g across the rebox ,isY the 'rear orashlrwall 25. Said walls are spaceda short distance from the ends ofsaidelementsv to form transversely extending end air linlet crevices orslots 26-27 respectively' between said element ends and said walls. NotAonly are said crevices or slots thus provided, but another advantageous`feature is that.. no abrasive action can take'place betweenA the endsofsaid elements and walls should anyrrelative movement occur between themunder exflow toward the-'rearfends o said elements so j pansion or,contractionV due t tot'` temperature lli) changes. Furthermore, strainsare, in this way,

avoided.

, To easily dene the most effective .width of said end slots,` so far-asthe entrance of air there.-

through is concerned for `assisting in sustainingcombustion,jI,-mayprovide along theend ofthe bottom plate 19v of each element, a pluralityof studs 28 and mounted thereon are strip members or plates 29havingtransverse slots ,30 through which `said studs extend. Uponsaid studsarethreaded nuts 31 all as best` shown in Fig. 4.V By

loosening said nuts, said strip members 29 may*A be moved towardvor awayfrom the associated wallA24-25 to give the desired width of slot 26--27respectively. With such an arrangement,

itis Y*not necessaryA to. worktov such close tolerances and therefore,one size of element may be applied to lireboxes of` different lengths.The entire bottom ofv the iirebox below Asaid .elements is closed byalpan 32 which extends from the burner wall to the ilash wall and fromonesideto the other of the irebox. This pan isV provided on its topsurface with a suitable refractory insulating lining 32', preferably ofasbestos, and :in said pan in line with each stud 28 is a hole 33 whichmaybe opened andclosed bya pivoted cover 34. By means of` such anarrangement,V it

is apparent that access may be had to the nuts 31 l for actuation whennecessary. The pan follows the inclination of the elements and is,thereiore, v

deeper or lower at the front end than at therear end., Vlhile` itispreferable thatthe holes 33 beA corner, Ewhich corner 4is the lowest yinelevation, Y* withA a "blow-off `connection 34'A which,zi nconnecftion'with-washout plugs 35 in the-sheets 9,; in linewith thel mouth-ofsaid elements, Apermits the ready vcleaning of said elements".A 1

In'theburner Wall, in` line with theairinlet slot '23, before mentioned,is locatedlan-opening 35 into which projects afuel nozzle-36 -by which ffuel, su`ch`v as toil, 4may be fed `'intotherebox,V above the elementstherein." A portion ofthe airi recessryrto support `coministion,`ente'rslthe rebox through'sa'id'- opening. Also disposed in' saidVlburner Wall, ypreferably to each. side of the* opening -`3 5 and belowsaidneIementS, are the ,sec-

ondary or"auxiliaryair f in'let openings 37 which open linto feachsideofthe air chambei-before mentioned; Entrance of airgthrough said-openf,

ings, may -befcontrolled byV damper-like doors 3 8.'Vlr -Eachfdoor is`mounted .upon a Vperpendicular shaft39 that extends down through theY'pan 32 f and `each is provided W'ith'anarm' 40. The arms -of bothdoors are'suitably connected with-linkage eabj of the locomotive.) 1 YIn the present instance, yI have shown apair of siphons 41 in theViirebox and each'siphom includes a perpendicularly disposed,substantially triangularl-y shaped, l `fiat, hollow staybolted vbody 42.The elongated top'end of eachfsiphonbody is openand'gis welded inasuitable opening'inthe-v crown sheet while the bottom 1 endV of said.body terminates ina tubularr neck43 connected to a= by which saiddoors'may be operatedj'from the suitable diaphragm-i4 inthe inner throatsheetPv just "above the horizontal portion ofthe burner Ink Fig'. 7, fisillustrated Vof construction'wherein the inner `closedje'ndsfoi? .the.elements yare made with 'abulge 22a. With such a construction itispreferable to spacev said Y ployed `in a lirebox is dependent uponthewidth 'foftheiireboi'iandwhen-apair-of -such siphons vareYemployed,-they are disposed oneupon eachside of thefrneclianline of therebox. f 1 51h-thatform-ofmy invention Vin which the ele--`mentsterminate in such spaced relation as Atopr'ovide; a uniform narrowslotfllike: air` `i1 1letf2- l`,l as best-shown diagrammatically inlig.8, the elements. gare notY truly #rectangular in shape. However, theyVcan be made ingdiierent'shapea ifdesired; -Thus,*'they` maybe, madesothat the longitudinal slot between' the* elements increases.inwidth-towardthe rear end, as V'shown diagrammatically-at"23-a inFig.9,` or so that it increases in '-Widtlr' toward 'theffrontv end, vasshown dia 5 grammameauyfat231iin Fig. 1o."` 'Y Instead yof* theJelements'being straight flatr V ones, asgshown' vin Figs. 2" and 3y;they maybe made With-1a reversedcurved `formation-,as indi- @md at':1.712 nuFie-Bi:

^ /bulgesa-greater distance apart to provide awider *fair inlet 23e.

' .In connection with any of the structures, vI-nia'y provide re bricks45 having taperingsides which rest upon .the closed sides of vthe-element.l Said taperingsidesrof thefiire brick may be provided Ywith grooves 46 'through whichair .may enter fromthe inlet 230,'intoVthe rebox. .These bricks, of.course,reach a high .temperature and shouldthe nozzle36; which atomizes the fuel,`disch argelf droplets o f thesaine,`the`se drpletswill fall upon said fbricks Yand`will'be.gimmediatelyvaporiedljf are reduced. f

tent.

other end ofthe element;`

--In`operation, with the -fuelforced linto the iire-g through the nozzleopening vv35. e 'Secondary lor auxiliaryyair fenters the' air chamberbeneath the elements l'llthrugh-the openings 3 7jand this air ispreheated-in-said'chamber by contact with the various heated surfacesthereof. VApart of 'v this heated Yse ':on`dt\lr-y'air entersl therebox'gto assist in combustion, =not only -through'the longi' tudinalvmedian" slot 23V but also `through )the` transverse endslots 26, 27 g"Thus, "instead of but a single Vairinlet at .the center of the firebox,the air`-enters-at`A di'ierentfpoints whereby 1a' better distribution-isprovided -for the same so that a. cleaner'and more efficient combustionresults. The intense heat, -fromthe" fuel I burning in v suspension-overthose portions of the elements 1 exposed there'to, causesv a rapidabsorption. of

passes to-and isabso'rbedby'the WaterV 'in' the upper vhalf a ofjsaidelements, greatly increasing theteniperaturethereof andconverting someof wardfinclination of saidV` elements, alike `flow is imparted-to'this'exceedinglyhot 'wateig colder water from the side Water legsflowingalong the bottom `wall of theelement towardfthe closed .Y f

sides of the elements. Because of the upward and yrearward inclinationof -said elements, la greater gravitation Vfaction of the water is feltin 1 said v`elements;'whereby 'circulation asV indicated by the arrowsis increasedfto an appreciable exi Also, counter` currents are? set-upfinv the flements', asindicated by the. 'arrows in Figs. -2 and heatby the top Wall parts thereof, which in turn,

l 3, so -that'colder-water passes into each-'element n elementsfalongland justl above the mud-ring.y 125i `Thus the-'elements described,each of which/has o nly one;1common or combined inlet'and outlet, notv*only v v -increase the acti-ve Water.` heating Asurface oa rebox lofthis-kind but insure a conditionjingthe various waterlegswhi'cheliniinates any still or quiet area of water therein, withtheresultfthat there is less scale accumulation which u vvouldfretardheat absorptionv by the water -It? is "appare-nt that the highesttemperature and 'greatest flame; volume Vwhich can radiantly effectthe'sur'faces or walls of said velements -exf tionof the upwardcirculation at said'en'd and a corresponding downward accelerationatlthe Thus inconnectionVV with the' water movement,inward and down! wardalong'the bottom wall of l theelement and' outward y and upward alongthe vtop wall; there is'also provided a'long'itudinalilow of Waterto-Ward the hotter end of the element rwhichina Vjterially essistsfinv thebetter distribution'of water l inthe1-water llegs and the lodging-sofsludge and ff-,

posed thereto, is'at that endV Vofthe ireboxf ope, positegthe fuelnozzle. This higher temperature atsaid end of said elementwillcauseaccelera- 14E .'2. A locomotive boiler `for burning insuspension over sa'ide elern nts. Y

sediment inthe bottom end portions of the elements from which it can beeasily flushed.

It is also apparent that the iiame of thefuel burning in suspensionSubstantially iills-thefireboit and envelopes the entireoutersurfaceofthe; siphons The water therein is heatedtofan eX treinely hightemperatureandapartjthereof is converted into steam and this passes outthrougli the top opening V,of the `Siphon into the boilerAconversioncJ-,a coal burning .locomotive to one burning fuel insuspension with but a smallarnount of4 labor and material and`thereconv` versionback into ac oal burner rnayalsobeq solely by :thevarious-'flanged the r eoi, from the` Side Sheets it isaprarent thattheyl may 115K to come andgo with theccntraction and expansion duetoteinperature changes;A I n those struc;

rtures whereinbriclrs ll5'areemployed, as such,

bricks are loose andmerelyfrest vgn the-adjacent sidesof the elements,theycanyshift to the eX-. tent necessary toaccorninodate the movement ofthe elements-as before mentioned. f

It will be understood that seine 0I" the 22e of KVadjacent,elements mayomit .theair grooves 46., In this way itis possible urtherto regulatethe air supply and properly adjust it to the particular installation. vvWhile in describing vthe invention, I havere-f ferredin detail tot thefor-in, arrangement and construction, of, the various` .parts'thereof,the 1 same vis' to be considered merely as` illustrative, and therefore,I do not wish to be limited `thereto except as may be specically setforthjin the appended clairns. f l u f I claim as my invention:v

' l. Av locernotivev boiler embodying therein a firebox having sidesheets defining the inner sides` oi side' water legs, 'saidvside waterlegsbeing closed. at the bottom, a holiow water circulating and steamingbottom vtherefor having opposite ly inclined transversely disposedportionswhich are fixed in therespectiveside sheets and which openlintorespective side water-legs, saidhollowf water circulating and steamingbottom extend- A j ing longitudinally of the iirebox at an angle to -fthe horizontal and to theplane of thedziottomgv closure ofthe side Waterlegs,l and `as burner positioned to discharge fuel]ioreburning in sus--Ypension over saidhollow waterrcirculating and steaming bottom.

embodying therein, a iirebozk:` havingside sheets .denning the innersides vof side water legs, a pair of hollow waterfcirculating andsteaming icleinents, each open, along one side, said open side Ybeingfixedin an associated sidesheet, each said elementgbeing inclinedtransversely lof the rebox, long itudi.-. nallyrof the nrebox andpafticularly-foreand aft withrespect tothe plane of the side waterk leg,and a` burner, positionedy to ldischarge fuel reas-,soa

n ijebogr having side .sheetsdening the innerv sides of side water legs,a pair of hollow water circulating and steaming elements,v each openalong one lside said open side being xed in an associated sidesheet, sothat it is inclined downwardly and yinwardly transversely of the fireboxand fore and aft at an angle to the horizontaland to the plane ofl thebottom of the side water leg longitudinally of the rebox, and.A a burnerpositioned to discharge fuel for burning in suspension oversaidelements, y Y,

AV locomotive boiler embodying therein a rebox having side sheets, apair of hollowrwater circulating and steaming elements, each ,closedalonngione side vandboth ends, and open'along the other `side and whichlatteris'iixed an asscciatedside sheet, s o that it is inclineddownvwardly and inwardly transversely ofthe iirebox` and Vupwardly andvrearwardly longitudinally of the-,iireboX` with respect to the bottomof; the

side wateifleg, anda burner positioned to discharge fuel vfor burning insuspension over said elements. y

5. ,A locomotive boiler embodying therein a rebox having side. sheetsAdefining the inner sides'` of side, water legs and front and backsheets, .front and back walls` arranged adjacent the iront Vand backsheets, and a hollow water' 'circulating and steaming bottom for thenreboxv having side portions opening into the vside water legs, saidwater bottom being of less length than they distance between saidfront/and back walls, therebylforming air feeding slots, and a burner tpositioned to discharge fuel 'for vburning in sus-Y briclg 45. whichspan the space Zqbetyveen the bulges pension, over vsaidfhollo'vv Waterbottom.

1 6. A ,locomotive boiler f embodying` therein Aa `ii'rebrnr having sidesheets denin'gthe inner sides or side water legs and front and backsheets,

front and back `walls arranged adjacent `the front and bachsheets, andahollowwater circulating and steaming, bottom for thejiirebox havingside portions openingiinto the side water legs, said water bottombeingof less length than the distance between said iront and baci;walls,.

thereby forming air feeding slots, means or controlling the area ofsaidslots, and a'burner positionedtto discharge fuel for` burning insuspension over said hollow .water bottom. Y

, '7. A locomotive boiler einbod rebox having side sheets' ,defining theinner sides of side-water legs and front and back sheets,A front andback walls arranged adjacent the jing therein ka A front and backsheets,` a hollOW Watercirculat-V K ing and steaming bottom for 'theliirebox having oppositely inclined transversely i disposed portions,Ywhich Y are yfixed in; the respective side sheets, and which openintofrespective side water legs, said water bottoni extendinglongitudinally of rthe firebox at an angle to thebott'om of the sidejwater" legs, and" said watergbottozn being of less length than 'thedistance between said'iront and back walls', thereby formingair feedingslots,

and" burner positionedV to discharge iuelior burning insuspension'oversaid hollow water bottom.` f Y J23g-A` locomotive boiler embodyingtherein a sides" offside 'waterrlegs and frontand back sheets, frontandffback walls arranged adjacent the irontY and'backsheets, la pair ofhollowwater fhav-ingside sheets defining the innerV circulatingandsteaming elements, each open along onefsidej saidopen side vbeing xedin an associated 'side sheet, and each 'element being longitudinallywith respectto the horizontal and` inclined transversely ci theiireboxand inclined,

sheet sothat it is inclined downwardly.'` Vand inwardly transversely ofthe rebox and upwardly of water legs', a pairof ,hollowvwatercirculating 1tothe plane of the bottom of vthe side ,Waterleg saidelements being offless length than the. distancebetween said front andback walls, theref ,by 'forming air feeding slots,` and a burnervpositioned to discharge fuel for burning over said hollow'waterbottom.. y

.9. A locomotive boiler embodying thereinV a sidewater, leglongitudinally ofthe rebox,"said Y elements being,L of .less length".thanV thedisftance between said front and back walls`,fthereby formingair feeding slots, .and aburner positioned to dischargel fuel forburningin suspension` over said hollow watery bottom.

n 10. A locomotive .boilerl embodying therein a iireboxhaving sidesheets defining. thejinner sides of side water legs and frontandbacksheets, front and back lwallsrarranged adjacent the front'and backsheets., a pair offhollow waterv circulating and steamingelements, eachclosed along'onefside and both ends and open along-theother side tancebetween said' frontand back'wall's, thereby firebox and toward the frontend and middle plane water circulating and steamingbottom, therebyandwhichlat'ter isjfixed in anassociatedV side and rearwardly.longitudinally of the rebox with respect to the bottomfofithe sidewater' leg, said elements beingfoflessjlength lthanithe disformingairZfeed-ingslotaandja burner positioned to discharge fuel for-burningin` suspension over said hollow water bottom.'V

Y 11. Allocomotive" boiler` embodying thereina reboxhaving sidewaterlegs, a hollow water cir` culating and `steaming 'bottomftherefor,having portions which open into opposite sidewater legs,

' a rebox bottom closureextending acrOSstheV firebox unde`r1 and in Yspacedr relation. to Vthe hollow forming an fair preheatingA chamberbeneath the l atter,-a burner vpositioned to discharge fuelfor burningin suspension overthe-hollowwater circulating and steaming bottom, andopenings for admittingair nrst into said preheating chamber and thenintothe combustion chamber."

12;'A locomotiveboiler embodying therein a` rebox having side nwaterlegs closedat .the bottom, a hollow water circulating'andsteamingbottom. therefor havingoppfositely inclined'transversely .disposedportions "whichv openl into the side water legs, and which,longitudinallyof the rebox, extend at anangle to the .bottom/closure ofthe sidewater; legs, a closure extending across the :FireboxV` under andin spaced relation tothe hollow water` circulating and steaming bottoni,therebyiorming kan air preheating chamber,V a

lburner vpositioned toV disclfiarge fuel ;forburning in suspension`overffthe l'iollow` water circulating andsteaming bottom;` `and an"opening Y for ,ad`

mlttmg am from' Sald preheamgL @amber to the*- longitudinally,Y withthe. clcsednside's vin4 spaced and steaming elements, each openvalc'pngone side,

said open -side `beingf "fixed in: anj associatedv 'side sheet so'that.'iti'is' inclineddownwardlyand inf in suspensiiufiY tothe bottom of theside waterleg longitudinally vof the iireb'ox, a closure extendingacrossthe Ire- 'f boxwunderandinspacedrelation to the 'hollow'. n

water circulating and steamingv bottom, thereby," -forniing anairpreheat'ing chamber, a burner positioned'to"dischargefuel; for burningin suspension over thefhollow water circulating and U ste'arningbottoimand an opening for admitting vairv from said -preheating chamber Ato thecom. 4bustion Chamber;

14; A locomotivejfboiler embodying't'l'ierein aL iirebox having sidevrsheets deningfthe inner sides of'water legs; al pairof" hollow water'cir.'-

both Vends and onesideand yopenalong the otherv wardly and rearwardlylongitudinally` ofthe fire'- box with respect Ato" thebottom ofthev sidewater leg, 'a closure'extending across the rebx under and Vinspacedrelation to the hollow water circu-Y jlating and steamngbottom,'therebyforming an airfpreheating chamber, afburner positioned to discharge fuelfor burning in suspensionover 10.0 -the hollow water circulating andsteamingbot# 'y tom, andan' opening for admitting air fromjsaidpreheating, chamber to the combustion chamber. y

1 5'. A locomotiveV boilerembodying thereinfa rebox having lside sheets`dening the` inner sidesA of sideiwater legs, a pair of hollow watercirculating and steaming elements eachclosed' along. one

side'. and openalong the other side an'd. each of which latter, isi'lxedgin an associated side sheet so that', said, element'extendsjdownwardly, forjurznalrdly and inwardly from therear endbf' thethereotand hence longitudinally' at a downward angle tothe bottom of,the respective side ,water leggthef, lower' edgesv of such 'inclinedelements being Yspacedapart to providefor the inlet ofaii;

upwardbetweenthem,and an airjpreheating :chamber underlying Lsaidelementsand'extend;

fing from end to end thereof. 1

t 16. ,A.vlocomotive.y boiler ,embodying'th'erein N' a.

rebox having 'side 'sheets` defining the innersides of sidey waterleg's;apair ohollow water circulat-r ing 4and steaming elements eachclosedalong one side andfopen along theother side Yand, which 1 saidl elements.extend downwardly andinwardly `one Vsicle and' both end sand Vopenalong. the other si'de and ,whichil'atter is fixedV in 4an associated Lside sheet sofasV 4to extend "downwardly and in-V wardlytherefrom;transversely -of the lreboxjandr atan 'angle tothe bottoniofthe side water legs'- relation, into providev a longitudinal air inletopen- 'ingsaidjvopen'side of 'each element'f providing ylatterisxedginfanassociated side sheet yso that 125-.therefrom,-transverselybi theV i'ebox and upfist ,145'. both th'inletand', outlet for.' saidrelement' disi-V posedl indirect communicationwith the associat- 7 5 i Wardlyl weefsel-refillsffboxf and' at an wel@.sonV over Seid; elemente aridi-fan ai? .geheeig i5@ 18. A locomotiveboiler `embodying `therein a rebox having side sheets deiining the innerside of side water legs, a pair of hollow water circulating and steamingelements each'closed along Vone side and both ends and open alongth'eother side which is `fixed. in an associated side sheet so as toextend downwardly' and inwardly therefrom,

VVtransversely of the rebox andlongitudinally at an anglewith respect tothe bottomk of theside ywater legsfwith the closed sides o said elements.in spaced relation, means bridging thespace be/ @--j 4tweensaidlclosedsides of said elements and formed tolp'rovide longitudinallyV spaced airinlet openings'therealong that open into thel rebox fand an airpreheating chamber underlying said Y elements and extending `fromend toend thereof.

.- ASheet softhat said element extends downwardly and inwardly fromsaidf side sheets, the closed sidesof said elements terminating in suchspaced relation as to provide al longitudinal air slot of varying widthand an air preheating chamber underlyng said elements and extending fromend 307 to end thereof ,e Y

`20. Av locomotive boiler embodying therein a -iirebox havingl sidesheets, a pair of hollow water 'circulating and steaming elements eachclosed r along one side and both ends and open along the n `3`5`` otherside and whichlatterlis iixed in'an associated side sheet so that saidelement extends downwardly andA inwardly therefrom, with thevclosedvsides of said elements in spaced relation, to" Vprovidea'longitudinal air inlet lopeningya 40' burner walljand a flash wall atopposite-'ends `of the Firebox,v one of said walls being spacedifrom'said associated end of said elements. f' *f '45 Y therassociated end ofsaid elements to provide an air inlet slot between saidone of saidvwalls an Y 2l. A locomotive boiler embodying therein a iirebox havingside sheetsya pairlof hollow water circulating'and steamingl elementseachjclosed (lil along one` side and both ends and open along the otherside and whichV latter is xedin an asso- 50.

ciated side sheet so that* said `'elements' extend downwardly andinwardly thereirom,r with the closed sides of said elements inspacedrelation to provide a' longitudinal air inlet opening, a burnerywall'and a flash wall at opposite ends of the nre- 4 xbox,Y both of Saidwalls being spacedvfro'm the associated ends of said elements to provideair inlet slots between said walls and said associated ends ofjsa'idelements.

" `2`2QA locomotive boilerembodying therein a viirebox` having sidesheetsi fa pair of hollow water circulating Vand steaming elementsV eachclosed yalongo'ne side andboth ends-and openy along" the other side andwhich latter is .'fixed in van t associated side sheet so thatsaid'element ex.-

Ylation to provide Ya longitudinal air;inlet opentends downwardlyand'inwardly therefrom,y with the Vclosedsides of saidaelernentsjinspacedreing,a burner wall and a flash wallY at opposite v. `ends4 offAthe rebox, Y one of saidA walls being spaced ,from the associated end ofsaidelements ,to providean airY inlet slot .between said-one yof saidwalls and said associated end of said elements and means-riorcontrolling "the area of 23. Aliocmotive boiler Ve'mbbe-y'n`1.g thereina 1 n l1,934,80o Y chamber underlying said elements and extending fromvend to end thereof.

iireboxV having side sheets, a pair 0I hollow `lwater circulating andsteaming elements each closed along one side and both ends and openalong the other side and which latter is fixed in an lassociated sidesheet so that said element extends downwardly and inwardly therefrom,with .the closed sidesv of said elements in spaced relation to provide avlongitudinal air inlet opening, a' burner wall and a iash wall atopposite Y t ends'4 ofthe iirebox, one of said walls being spaced Lfromthev associated end of said elements 'to provide an air inlet slotbetween' said one of'said walls and said associated end'ofy saidelements and means for controlling the, width orsaidslot. v 242Alocomotive boilerembodying therein a irebox'havingside sheets,` a pairof hollow water "circulating and steaming `elements each` closed along vone side and both endsand open along the vother side and which latter isfixed in an associated side sheet so that 'said element extendsdownwardly and inwardly thererom,'with `theclo'sed sides ofisaidelementsin spaced relation, to provide a longitudinal lairinletopening,vafburner wall and a flash'wall at opposite ends'or the iirebox,oneof said walls being spaced from the associated end of saidy elementsto. provide anA an air inlet slot between said one of said walls andsaid associated end of said elements and means carried by saidassociatedvend of' said elements for controlling the width ofsaid slot;` j j f25,' Avlocomotivek boiler e VVbodying therein a iirebox -having sidesheets, a pair of. hollow water circulating Yandi-steaming elements eachclosed along one side and both ends and open 'along the other v'side andwhich latter is iixed in an associated side sheet so that saidelementextends Ydownwardly and: inwardly therefrom,

`withthe closed sides of said elements in spaced relation, to provide avlongitudinal air inlet opening, a vburner Vwall and a iiash wall atopposite endslof the iireb'ox'fboth of saidfwalls-'being spaced Afromtheassociated ends of said elements toprovide ,air inlet slots betweensaid walls and saidY associated ends of said elements and means forcontrolling the areas of said slots.

" 26. A locomotive boilerl embodying therein `a iirebox having sidesheets, a pair of hollow'water circulating and steaming elements' eachclosed along yone side vand both ends and open along the other side andwhich latter is'iixed in an associated side sheet sov that saidv elementeX- ltendsdownwardly and inwardly therefrom, with the closed sides ofsaid elements in spaced relation, to provide a longitudinal air inletopening, a burner walland flash wall atcopposite ends of the firebox,both of said walls being spaced from vthe vassociated Vends of saidelements to provide airinlet slots between said walls and saidassociatedends of said elements,V .and'vmeans Vfor controlling the widthof said slots.

271A locomotiveboiler embodyingV therein a lreboxhaving"'side sheets,apair o'f hollowr water Vcirculating and-'steaming elements each vclosedA `along one 'side' andmboth ends andlfopenl alongv 'theother side andwhich latter Vis iixed in an associated sid'e'sheet so that saidrelement extends downwardly and inwardly' therefrom, with the closedsides of=sai`d elements in spaced relation' to provide a longitudinalair inlet opening, a burner wall and a flashwall at opposite ends of theiirebox,V both ot"V said walls ybeing spaced 'from the-'associatedends'Y offsaid elements-to lJOVde ai? inlet 'slots'between said wallsand- @Lannoo Asaid assoiatedendsof said elements, andmeans carried byYsaid 'associatedpends Vof said. elements for controlling the v lidth..of said slots.

28. Alocomotive bo'ler ,embodying thereina firebox having-side sheets,ay pair of hollow Water inwardly therefrom, with the closed sides ofsaid,

elements in spaced relation and refractory members resting at oppositesides on said closed sides of said elementsto bridge the space betweenthe same and formed to vprovide air inlet openings that open atoppositesdes into the rebo-x.

29. A locomotive boiler embodying thereina rebox having side sheets, apair of hollow water circulating and steaming. elements each closedalong one side and both ends and open along thek other side and whichlatter is xedin an associated side sheet so as to extend downwardly andinwardly therefrom, with the closed sides of said elements in spacedrelationmeans bridging the space betweensaid closed sides of saidelements and formed to provide longitudinally spaced air inlet openingstherealong that open into the reboX, a burner and a flash wall atopposte ends of the iirebox, both of said walls being spaced vfrom theassociated ends of said` elements to provide air inlet slots for saidends of the rebox.

30. A locomotive boiler embodying therein a rebox having side sheetsdefining the inner side Y of side water legs which are bottomed byY amud ring, a pair of hollow Water circulating and steaming elements, eachclosed along one side-and both ends and open along the other sidev whichis fixed in an associated side sheet sothat saidl element extendsYdownwardly and `inwardly Vfrom said side sheets, withV the closedlsidesin spaced relation,- said eleinents also' being inclined down- Wardlytoward the front of the rebox with respect to said mud ring;

31. A locomotive boiler embodying thereinv a reboX havingv side Sheets,a pair of hollow water circulating andv steaming elements, each closedalong one 'side and both ends and Vopen along the other sideV and whichlatter is fixed-inten associated side sheet'so that said"element extendsdownwardly and inwardly vfrom said side sheets,

l the closed sides of said elements being in av spaced relation, toprovide a longitudinal air inlet slot, said elements also being.inclined downwardly to-l ward the front of the fireboX anda burner walland a flash wallet opposite ends ofthe reboX, 4

one of said walls being'spaced from, the associated end of saidelement-to, provide a transverseair inlet slot between said one vof saidwalls and said end of said elements. f jij. Y

32. A locomotive .boiler embodying therein a firebox having sidesheets,- apairof hollow water circulating and :steaming elements, eachclosed along one sideand both ends and openalong the other side andwhich latter is Xed in an associated side sheet so that said elementextends downwardly and inwardly from said side sheets, the

closed sides of said elements being in a spaced- V relation, to providelongitudinal air inlet slot,

' 'said element also beinginclined downwardly to- -ward the front oftherebox anda burner wall and a ash wall at opposite -ends Vof ltherebox,

both of said walls being spaced from the Vassociated ends of saidelements to provide transverse air inlet slots between said ends ofsaidelements ,.rebox having side -water legs bottomed by a mud ring,ajpair of vhollow water circulating and 'steaming elements each closedalong one side and bothendsandopenalong the other side and which latteris lXed-in a side sheet of the rebox soyasfto communicate with anassociated side atan inclination to the horizontal as well as to planeof said mud ring to promote and direct circulation and also tor providea sludge pocket in said water leg which is deeper at the rear end thanit is at the front end; l

34. A locomotive boiler embodying therein a rebox having side sheets, apair of hollow water circulating and steaming elements, each closedalong one side and both ends and open'alongthe other side and whichlatter is xed in an associated side sheet. so that said element extendsdownwardly and inwardly from said side sheets, the closed sides of saidelements being in a spaced relation to form a longitudinal air inletslot, a burner wall and a flash wall at opposite endsof the reboX, oneof said walls being spaced from an associated endof said elements topro- `vide, a transverse `air inlet slot between said one vtends'downwardly and inwardly from said side in a spaced relation, aburner wall and a flash wall at opposite ends of the rebox, both of saidwalls being spaced from the associated ends of said elements to thereprovide transverse air in--, let slots and means coactingwith saidelements to provide an airchamberV beneath said elements and with'whichsaid air inlet opening and slots communicate. Y

36. A locomotive boiler embodying therein a iirebox Vhaving side sheets,a pair of hollow waterY circulating and steaming elements, each closedalong one side and both ends and open along vthe'iother side and whichlatter is Xed in an associated side sheet so that said element-extendsdownwardly and inwardly'from said side sheets, the closed sides of saidelements being in a spaced relation, a burner wall and a flash wall atopposite ends of the Arebox, vone of said walls'being spaced from anassocatedend of said elements to provide a transverse air inlet -slotrbetween said one of said walls, and said associatedend of saidelements, means coacting with said elements to provide an air chamberVbeneath said elements and'with which said'air inlet opening and slotcommunicate, there being a lprimary Vair inlet -in said burner wallopening into the rebox above said elements, and a fuelnozzle in saidprimary air inlet, there being-secondary air inlets in said burner' wallopening into said chamber.

37. AY locomotive'boiler'embodying thereinf a Y .rebox having sidesheets, a pair of hollow waterA circulating and steaming elements,-eachfclosed *along one side and both ends and open along the other sideandwhich 'latterisfxed in an asso- 1 .provide an air chamber beneathsaid elements land'with which' said airV inlet opening and slotcommunicate, there being a primary air inlet in said burner wall openingvinto the rebox above said e1e1nents,a fuel nozzle in said primary airinlet, there being secondary air inlets in said burner wall opening intosaid chamber and means for controlling the effective area of saidsecondary air inlets.

" CHARLES GILBERT HAWLEY.

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